Les divers phénotypes de l'isozyme estérase, la production de l'argenture (SSL) et la transmission de tomato yellow leaf curl begomovirus-Sardinia (TYLCV-Sar) ont été analysés pour étudier la variation dans les populations italiennes de Bemisia tabaci (Gennadius). Après ces analyses, le biotype B et un biotype Q (qui resemble au biotype espagnol) ont été trouvés dans les adultes et la présence de beaucoup d'adultes sans bandes d'estérase était observée. Le biotype B a été trouvé en Italie dès 1989. Toutes les populations italiennes montraient la même abilité a transmettre TYLCV-Sar; la transmission de ce virus n'était pas reliée au phénotype estérase. Seulement les populations de Liguria et Sardegna étaient capables de provoquer l'argenture; tous les adultes de ces populations étaient du biotype B. Nous avons démontré que le biotype B est présent EN Italie du nord et en Sardegna dans les serres, et qu' un biotype Q est présent en Italie du sud en champ. Ces résultats suggèàrent que le biotype B a sans doute été introduit lors de la commercialisation des plantes ornamentales, alors que le biotype Q est originaire du Bassin Méditérranéen.
Esterase banding patterns in native polyacrylamide gel electrophoresis, squash silver leaf (SSL) induction, and tomato yellow leaf curl begomovirus-Sardinia (TYLCVSar) transmission capability were investigated to evaluate variations among populations of Bemisia tabaci (Gennadius) from Italy and to relate their distribution to their geographic origin. Adults of the B biotype, adults of the Q-like biotype (which is similar to a Spanish biotype), and adults without esterase bands were found. The B biotype has been found in Italy since 1989. Two populations, including mainly B and Q-like biotypes, showed similar TYLCV-Sar transmission efficiency, independent of esterase banding pattern. Only populations from Liguria and Sardinia, which contained almost exclusively B-biotype individuals, were able to induce SSL. We observed that adults of the B biotype are widespread in greenhouses of northern Italy and Sardinia, whereas those of the Q-like biotype are present only in fields of southern Italy. These results suggest that the B biotype of B. tabaci was introduced into Italy likely while trading ornamental plants, whereas the Q-like biotype is native to the Mediterranean region.
Distribution of Bemisia tabaci (Hemiptera: Aleyrodidae) biotypes in Italy
MARIAN D;
2000
Abstract
Esterase banding patterns in native polyacrylamide gel electrophoresis, squash silver leaf (SSL) induction, and tomato yellow leaf curl begomovirus-Sardinia (TYLCVSar) transmission capability were investigated to evaluate variations among populations of Bemisia tabaci (Gennadius) from Italy and to relate their distribution to their geographic origin. Adults of the B biotype, adults of the Q-like biotype (which is similar to a Spanish biotype), and adults without esterase bands were found. The B biotype has been found in Italy since 1989. Two populations, including mainly B and Q-like biotypes, showed similar TYLCV-Sar transmission efficiency, independent of esterase banding pattern. Only populations from Liguria and Sardinia, which contained almost exclusively B-biotype individuals, were able to induce SSL. We observed that adults of the B biotype are widespread in greenhouses of northern Italy and Sardinia, whereas those of the Q-like biotype are present only in fields of southern Italy. These results suggest that the B biotype of B. tabaci was introduced into Italy likely while trading ornamental plants, whereas the Q-like biotype is native to the Mediterranean region.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
